[gst-devel] About videotest and rtsp-server : is-live true and false

[yangsb]

Hi , luca 
I tried this version :
http://cgit.freedesktop.org/gstreamer/gst-rtsp-server/commit/?id=de1ebbc21be20ab1ac6a6888e9830e084264e4d5
But it seems doesn't work.

I read the log messages from client( vlc media player  ).
###########################################
packetizer_h264 warning: waiting for SPS/PPS
###########################################
So, the thing we miss between the two set_state may be NAL_SPS

Hope to be helpful



yangsb wrote:
> 
> Hi, Luca
> Thanks for your reply.
> I need to post my environment .
> gstreamer-0.10.21
> gst-plugin-base-0.10.21
> gst-plugin-good-0.10.10
> gst-plugin-ugly-0.10.9
> gst-plugin-bad-0.10.10
> gst-rtsp-server-0.10.1 (
> http://cgit.freedesktop.org/gstreamer/gst-rtsp-server/commit/?id=e789a8fdf31aeae4234a2fb7a7e4b251b47edfa5
> )
> 
> I think the bug may be lies in the rtsp-server.
> Plesae check this version of rtsp-server:
> http://cgit.freedesktop.org/gstreamer/gst-rtsp-server/commit/?id=de1ebbc21be20ab1ac6a6888e9830e084264e4d5
> 
> 
> Thanks 
> Best regards.
> 
> 
> Luca Ognibene-3 wrote:
>> 
>> On Wed, Apr 1, 2009 at 12:37 PM, yangsb <yangsb05 at gmail.com> wrote:
>>>
>>> I am trying my rtsp-server using videotestsrc as the video input.
>>> I found that if the property is-live of videotestsrc is false , my
>>> server
>>> works fine.
>>> Buf if is-live of videotestsrc is true , my server still works , but the
>>> client ( vlc media player  )
>>> can only receiving  packets , not able to decode and display images.
>>>
>>> I wish to know what happens to videotestsrc when is-live becomes true ?
>>>
>> 
>> Hi, i had the same problem yesterday so i know what's going on! At
>> least i think..
>> If you set is-live to false:
>>  * client(vlc) send DESCRIBE request
>>  * rtsp-server creates your pipeline
>>  * rtsp-server set_state(gst.STATE_PAUSED) and wait for preroll
>>  * rtsp-server reply to client
>>  * client send SETUP and PLAY request
>>  * rtsp-server set_state(gst.STATE_PLAYING) your pipeline
>> 
>> If you set is-live to true:
>>  * client(vlc) send DESCRIBE request
>>  * rtsp-server creates your pipeline
>>  * rtsp-server set_state(gst.STATE_PLAYING)  (there's no preroll in a
>> live pipeline)
>>  * rtsp-server set_state(gst.STATE_PAUSED)
>>  * rtsp-server reply to client
>>  * client send SETUP and PLAY request
>>  * rtsp-server set_state(gst.STATE_PLAYING) your pipeline
>> 
>> This way your client loses buffers created from the first to the
>> second set_state and if you're encoding in mpeg4/h264 or so your
>> client will need to wait for the next keyframe to display something.
>> This is whay i've understood yesterday looking at rtsp-server code
>> (mainly rtsp-media.c).. please correct me if i'm wrong :)
>> 
>> ciao
>> Luca
>> 
>> ------------------------------------------------------------------------------
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>> 
>> 
> 
> 

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